00:00
Let’s start by looking
at the ilium. We can see the ilium is this
large wing-shaped bone. It’s the most superior
and largest of the three bones, and it forms
the superior part of the acetabulum.
00:15
So if we look here on the lateral surface, this
is all ilium here, and we can see it’s actually
going to form the superior parts of the acetabulum.
So a line going in approximately this direction
here would be the separation of the ilium with
the ischium and the pubis. So this line
here is separating the ilium above. The body
of the ilium, if we have a look here, on the
lateral surface, we can see the body of the
ilium. We can see it here with the superior
surface, the body of the ilium, and that’s
joining to the pubis and the ischium at the
acetabulum like I said. Then we have this
large wing of the ilium, and we can see two
parts of that. We can see the ala here, this
large flat surface. And then at the top of
this wing, we can see we have the iliac crest.
We can see the iliac crest is running over
here. See, on the lateral surface, we can
also see on this medial surface. Within the
iliac crest, we can see on the superior surface,
there are a couple of features. So if we look
for the bony landmarks of the ilium. Then
most anteriorly, we can see it here on this
medial surface, we’ve got the anterior superior
iliac spine. So, the iliac crest is coming
around the top, and it finishes here as the
anterior superior iliac spine. Inferior, we
have an anterior inferior iliac spine. And
these bony landmarks are important because
they offer attachment sites for muscles. More
posteriorly, we’ll find we have the posterior
superior iliac spine, and then below it, we’ll
have the posterior inferior iliac spine.
02:04
And we can see this on this medial surface.
We can also see them on the lateral surface.
02:09
Here’s the anterior superior iliac spine,
anterior inferior iliac spine. And here we
have our two posterior iliac spines. And we
could make them out on this superior view
as well. If we were to just look at the lateral
surface of the ilium, then this is important
because it gives rise to attachments for gluteus
maximus. In order to be comfortable with the
attachments of gluteus maximus, we need to
be aware of some gluteal lines. So here, we
can see a whole series of gluteal lines; anterior,
inferior, and posterior. Here, we can see
an anterior gluteal line. See that here. Here, we
can see inferior gluteal line running alongside
the body of the ilium. Here, we can see a
posterior gluteal line running alongside the
posterior iliac spines. So it’s the important
gluteal lines which you should be familiar
with as we look at the attachment sites later
on of the gluteal muscles.